Tread surface and periphery of a footwear unit sole



FIG. 1 is a bottom plan view of a tread surface and periphery of afootwear unit sole showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is an front edge elevational view thereof; and,

FIG. 5 is a rear edge elevational view.

The ornamental design for a tread surface and periphery of a footwearunit sole, as shown and described.